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Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Change in goodwill
The following table presents the change in goodwill for the periods indicated:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Balance at the beginning of the period
 
$
187,549

 
$
119,029

 
$
119,029

 
$
119,029

Additions as a result of acquisitions (1)
 
53,288

 

 
121,808

 

Balance at the end of the period
 
$
240,837

 
$
119,029

 
$
240,837

 
$
119,029

(1) See Note (2) Business Combination
Change in other intangible assets
The following table presents the change in other intangible assets for the periods indicated:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Balance at the beginning of the period
 
$
15,767

 
$
6,727

 
$
6,088

 
$
7,374

Additions as a result of acquisitions (1)
 
7,075

 

 
18,345

 

Amortization
 
(1,114
)
 
(319
)
 
(2,705
)
 
(966
)
Balance at the end of the period
 
$
21,728

 
$
6,408

 
$
21,728

 
$
6,408

(1) See Note (2) Business Combinations